Análise física-reológica de ligantes asfálticos modificados com óleo de algodão refinado para uso em misturas asfálticas mornas

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Abstract

The need for sustainable development and greater energy efficiency in the paving area has driven the search for mixing and compaction temperatures for asphalt mixtures lower than those conventionally used. In search of lowering the paving temperature and lowering energy consumption, it is sought to replace hot asphalt mixes with warm mixes. The use of oleic additives as asphalt binder modifiers can be a viable and environment-friendly modifier due to the possibility of promoting reductions in binder viscosity and a decrease in mixing and compaction temperature. Thus, this study evaluated the physical and rheological characteristics of the asphalt binder classified with 50/70 penetration modified by the addition of refined cottonseed oil at levels of 1%, 2%, 3%, 4%, 5%, and 6%. The samples were analyzed before and after the short-term aging procedure (Rolling Thin-Film Oven-RTFO), by means of Penetration, Softening Point, Rotational Viscosity, Performance Grade (PG), and Multiple Stress Creep Recovery (MSCR). The results showed that the addition of oil at the levels studied made it possible to reduce the mixing and compaction temperatures of the asphalt mixtures by up to 10ºC for the highest oil content added to the asphalt binder. Refined cottonseed oil presented itself as a good viscosity and working temperature reducer modifier for asphalt mixtures, where all tested contents were classified for use on standard traffic roads.